133973 has 4 divisors (see below), whose sum is σ = 153120. Its totient is φ = 114828.

The previous prime is 133967. The next prime is 133979. The reversal of 133973 is 379331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379331 = 139 ⋅2729.

It is an interprime number because it is at equal distance from previous prime (133967) and next prime (133979).

It is not a de Polignac number, because 133973 - 2⁸ = 133717 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9563 + ... + 9576.

It is an arithmetic number, because the mean of its divisors is an integer number (38280).

2¹³³⁹⁷³ is an apocalyptic number.

It is an amenable number.

133973 is a deficient number, since it is larger than the sum of its proper divisors (19147).

133973 is an equidigital number, since it uses as much as digits as its factorization.

133973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19146.

The product of its digits is 1701, while the sum is 26.

The square root of 133973 is about 366.0232233069. The cubic root of 133973 is about 51.1688622928.

The spelling of 133973 in words is "one hundred thirty-three thousand, nine hundred seventy-three".